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The session id in Wowza is used to determine multiple things, when connecting to Wowza using http like an iOS device the session id is created and then allows Wowza to refer all chunks to the same session id.

This also allows Wowza to keep a count on clients connected to Wowza, if the chunks for example didn't have the session id it would appear that Wowza would have hundreds or even thousands of connections because each chunk would count as a connection to Wowza.